/*!
 * Crypto-JS v1.1.0
 * http://code.google.com/p/crypto-js/
 * Copyright (c) 2009, Jeff Mott. All rights reserved.
 * http://code.google.com/p/crypto-js/wiki/License
 */


var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

var util ={

    // Bit-wise rotate left
    rotl: function (n, b) {
      return (n << b) | (n >>> (32 - b));
    },

    // Bit-wise rotate right
    rotr: function (n, b) {
      return (n << (32 - b)) | (n >>> b);
    },

    // Swap big-endian to little-endian and vice versa
    endian: function (n) {

      // If number given, swap endian
      if (n.constructor == Number) {
        return util.rotl(n,  8) & 0x00FF00FF |
               util.rotl(n, 24) & 0xFF00FF00;
      }

      // Else, assume array and swap all items
      for (var i = 0; i < n.length; i++)
        n[i] = util.endian(n[i]);
      return n;

    },

    // Generate an array of any length of random bytes
    randomBytes: function (n) {
      for (var bytes = []; n > 0; n--)
        bytes.push(Math.floor(Math.random() * 256));
      return bytes;
    },

    // Convert a string to a byte array
    stringToBytes: function (str) {
      var bytes = [];
      for (var i = 0; i < str.length; i++)
        bytes.push(str.charCodeAt(i));
      return bytes;
    },

    // Convert a byte array to a string
    bytesToString: function (bytes) {
      var str = [];
      for (var i = 0; i < bytes.length; i++)
        str.push(String.fromCharCode(bytes[i]));
      return str.join("");
    },

    // Convert a string to big-endian 32-bit words
    stringToWords: function (str) {
      var words = [];
      for (var c = 0, b = 0; c < str.length; c++, b += 8)
        words[b >>> 5] |= str.charCodeAt(c) << (24 - b % 32);
      return words;
    },

    // Convert a byte array to big-endian 32-bits words
    bytesToWords: function (bytes) {
      var words = [];
      for (var i = 0, b = 0; i < bytes.length; i++, b += 8)
        words[b >>> 5] |= bytes[i] << (24 - b % 32);
      return words;
    },

    // Convert big-endian 32-bit words to a byte array
    wordsToBytes: function (words) {
      var bytes = [];
      for (var b = 0; b < words.length * 32; b += 8)
        bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
      return bytes;
    },

    // Convert a byte array to a hex string
    bytesToHex: function (bytes) {
      var hex = [];
      for (var i = 0; i < bytes.length; i++) {
        hex.push((bytes[i] >>> 4).toString(16));
        hex.push((bytes[i] & 0xF).toString(16));
      }
      return hex.join("");
    },

    // Convert a hex string to a byte array
    hexToBytes: function (hex) {
      var bytes = [];
      for (var c = 0; c < hex.length; c += 2)
        bytes.push(parseInt(hex.substr(c, 2), 16));
      return bytes;
    },

    // Convert a byte array to a base-64 string
    bytesToBase64: function (bytes) {

      // Use browser-native function if it exists
     // if (typeof btoa == "function") return btoa(util.bytesToString(bytes));

      var base64 = [],
          overflow;

      for (var i = 0; i < bytes.length; i++) {
        switch (i % 3) {
          case 0:
            base64.push(base64map.charAt(bytes[i] >>> 2));
            overflow = (bytes[i] & 0x3) << 4;
            break;
          case 1:
            base64.push(base64map.charAt(overflow | (bytes[i] >>> 4)));
            overflow = (bytes[i] & 0xF) << 2;
            break;
          case 2:
            base64.push(base64map.charAt(overflow | (bytes[i] >>> 6)));
            base64.push(base64map.charAt(bytes[i] & 0x3F));
            overflow = -1;
        }
      }

      // Encode overflow bits, if there are any
      if (overflow != undefined && overflow != -1)
        base64.push(base64map.charAt(overflow));

      // Add padding
      while (base64.length % 4 != 0) base64.push("=");
        console.log(base64)
      return base64.join("");

    },

    // Convert a base-64 string to a byte array
    base64ToBytes: function (base64) {

      // Use browser-native function if it exists
      //if (typeof atob == "function") return util.stringToBytes(atob(base64));

      // Remove non-base-64 characters
      base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");

      var bytes = [];

      for (var i = 0; i < base64.length; i++) {
        switch (i % 4) {
          case 1:
            bytes.push((base64map.indexOf(base64.charAt(i - 1)) << 2) |
                       (base64map.indexOf(base64.charAt(i)) >>> 4));
            break;
          case 2:
            bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0xF) << 4) |
                       (base64map.indexOf(base64.charAt(i)) >>> 2));
            break;
          case 3:
            bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0x3) << 6) |
                       (base64map.indexOf(base64.charAt(i))));
            break;
        }
      }

      return bytes;

    }
  }
 export {
    util
}
